Spring-actuated hammer.



F. J. SHEPHERD, C. PAUL] &H. W. PLEISTER.

SPRING ACTUATED HAMMER.

APPLICATION man DEC.I8. 1913 I I m 2 4 .1 a .w D Q 5.; d 1 M a L r w m n w Q P e 7. M w 3w 1 a fi llNltllllED 222A? E2 PATENT @FFltGFl.

FREDERICK J. SHEPHERD, OF GRANT'i/VOOD, CARL PAULI,

OF ROSELLE PARK, AND

HENRY W. PLEISTER, OF WESTFIELD, NEVLT JERSEY, ASSIGNORS TO HENRY B. NEWHEiLL, OE PLAINFIIJLD, NEW JERSEY.

SPRING-ACTUATED HAMMER.

Application filed December 18, 1813.

To all whom it may concern:

Be it known that we, FREDERICK J. SHEP- Hnnn, a citizen of the United States, residing in Grantwood, in the county of Bergen and State of New Jersey, CARL PAULI, a citizen of the United States, residing at Roselle Park, in the county of Union and State of New Jersey, and HENRY W. Pnnrs'rnn, a citi- Zen of the UnitedStates, residing at W est field, in the county of Union, State of New Jersey, have invented certain new and useful Improvements in Spring-Actuated Hammers, of which the following is a specification. A

Our present invention relates to hammers of the type disclosed in pending application, Serial No. 719,735, filed Sept. 11, 1912, Upson and Pleister, but more especially to an improved mode of storing energy for operating and delivering it to the percussion memher.

In the drawings, Figure l is an elevation with the face plate broken away to show the preferred mode of connecting the spring and hammer. Fig. 2 is an elevation with the face plate broken away showing a variant of such connection. Fig. 3 is an axial section, and Figs. at and 5 are fragmentary views showing analogous tension adjusting devices.

Vi e provide a substantially cylindrical housing 1 with diametrically opposite breaststock and tool-stock bosses, 2 and 18 respectively, an axial stud-boss 9 for a stud 9, a face-plate to close the housing and inclose the working parts, (except the hammer stock) on the stud 9 we revolubly mount a hammer-retracting cam-disk 11 armed with a plurality of cams 12; and in the bore 14 of the boss 13 we locate a hammer stock 22 having in its face a cam groove 24 with which, when the cam-disk 11 is revolved (by its crank 40 or otherwise) the cams 12 successively engage and disengage, to retract the hammer and compress and store energy in the spring 26 and to release thehammer so that it can be thrown outward bysaid spring.

In our present invention we embody a novel, efficient and durable energy storage member 260 which comprises a slotted stock head 221 fitted on the hammer stock 22, and tensional spring means such as a duplex tensional hehcal spring 26 strained between Specification of Letters Patent.

Patented Dec. it, 1*

Serial no. 807,415.

formed into a recessed saddle 220, around which is bent a helical tension spring 26 whose ends are attached to suitable tensional adjusting means rotatably arranged in the housing 1.

In the variant, Fig. 2, the stock head 221 is provided with ears 219 and helical tension springs 28 are strained between said ears and suitable abutments on the housing. It is well known that helical springs, which operate by torsional elasticity, are much more resilient, durable and reliable than springs which operate by bending; and that tensional springs tend to preserve and return to their normal condition and position, and are therefore greatly to be preferred to plate and compression springs. The type of spring illustrated in Fig. l is generally preferable because it provides the greatest length of spring and therefore the most extensible, but both types function similarly and are very efficient because their resultants lie in, or nearly in, the axis of the hammer.

As a means for adjusting the tension of the spring members 26 in the hammers shown in Figs. 1 and 2, we provide in the housing, in proximity to the spring and 0p posite to the stock head end, a pair of shouldered studs 22%: which are rotatably mounted in the housing 1, the flanged or collar portion of the studs projecting into the in terior of the housing, an extension of the stud projecting outside of the housing in such a manner as to permit the attachment thereto of a pair of segmental gear members 225 which members are meshed with one another. The shoulders of the said studs are square and the segmental gears have rectangular apertures therein to fit the said studs and to thereby transmit rotary 1notion from one stud to the other. One of the said studs has arranged thereon a lever 226 which is provided with a handle 227 and, as indicated in Fig. 4, a plurality of stops are arranged on the outside of the said housing to engage the said lever 226 in any one of three positions, according to the ten sion required on the springs 26. For instance, if a light tension is desired, the handle 227 is placed at the notch marked A, Figs. 2 and a. A slight increase in tension is obtained by moving the handle to the second position, B, and the extreme tension is obtained through the movement of the handle to position 0. In the form of spring tension shown in Fig. 1, there is only one tensioning device shown, owing to the spring 26 being a single element from one point of attachment to the point of adj ustment, both said points being arranged on the housing so that it is only necessary to provide manual adjusting means similar to that shown in Fig. 2 with the exception of the segmental members which are not required, therefore the like parts of the tensioning means appear indexed alike.

In Fig. 5 is shown an alternative form of adjustment, the same being in the form of an eye-stud which has a threaded shank, the threaded end being entered through a hole 29 which is located in a suitable position in the housing, preferably in alinement with one of the lugs 26, as shown in Fig. 1. A threaded thumb nut 230 is thereafter screwed on the threaded shank of the eye bolt 228 and the tension of the spring adjustment will, by manipulation of the said wing nut 230, be increased or decreased as desired.

Having thus described our invention, we claim:

1. In a hammer of the class described, a housing, a boss centrally located therein, a revoluble plural faced cam mounted in said boss, a hammer, a cam face thereon adapted to be engaged and disengaged by successive cam faces of said cam, a slotted stock-head connected with said hammer and enveloping said boss, a helical tensional spring strained between said housing and said stock-head, and means for adjusting the tension of the spring.

2. in a hammer of the class described, a housing, a boss centrally located therein, a revoluble plural faced cam mounted in said boss, a hammer, a cam face thereon adapted to be engaged and disengaged by successive cam faces of said cam, a slotted stock-head connected with said hammer and enveloping said boss and having its free'end formed into a saddle, a helical tensional spring connected to said housing and bent about said saddle, and means for adjusting the tension of said spring.

3. Ahammer of the class described, in combination, a housing, a shaft extending transversely through the housing, a cam disk rotatable within said housing and mounted onsaid shaft, and a spring tensioned, axially slotted, canractuated hammer guided in said housing, a boss on said disk, said slotted end of said hammer being in engagement with said boss to form the hammer guide.

4. In a hammer of the class described, a housing, a driving shaft extending through said housing, a boss mounted on saiddriving shaft, a revoluble plural-faced cam mounted on said boss, a hammer, a cam face thereon adapted to be engaged and disengaged by successive cam faces of said cam, a slotted stock-head connected with said hammer and enveloping said boss and having its free end formed into a saddle, and a helical spring connected to said housing and bent about said saddle.

5. In a hammer of the class described, a housing, a hammer, means for actuating said hammer in one direction, a stock-head on said hammer having its head formed into a saddle, a helical tensional spring connected to said housing and bent about said saddle thereby to actuate said hammer in the other direction, and means for adjusting the tension of said spring, said adjusting means comprising a stud extending through said housing, a crank pin connected to said stud to which pin one end of said helical spring is connected, the other end being connected to the housing, a handle connected to said stud and positioned on the outside of said housing, pairs of lugs on the outside of said housing arranged in a circular row, each pair of lugs forming a slot in which the handle is disposed to be secured at any one of its adjustments.

FREDERICK J. SHEPHERD. CARL PAULI. HENRY W. PLEISTER.

Witnesses:

HENRY .B. NEWHALL, J r., A. M. WILLIAMS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

